Fire preventing duct for passing cables and pipes through walls and bulkheads



FIG. 1 is a perspective view of a fire preventing duct for passing cables and pipes through walls and bulkheads showing our new design;

FIG. 2 is a front view thereof, the rear view, right side view and left side view corresponding to the front view; and,

FIG. 3 is a top view thereof, the bottom view corresponding to the top view. 

The ornamental design for a fire preventing duct for passing cables and pipes through walls and bulkheads, as shown and described. 